Figure 4From: Pregabalin, the lidocaine plaster and duloxetine in patients with refractory neuropathic pain: a systematic review Quality of life outcomes measured by the NRS (sleep and function interference, pain associated distress) for pregabalin [22, 41]. p values are compared to baseline. Freynhagen 2007, baseline N = 53, endpoint N = 50; Douglas 2008, baseline N = 30, endpoint N = 30Back to article page